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Commit 0c7f46ad authored by Wang Xingchao's avatar Wang Xingchao Committed by Takashi Iwai
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ALSA: hda - check supported power states 



Add function to check whether power states supported by specific
codec node.

Signed-off-by: default avatarWang Xingchao <xingchao.wang@intel.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 167d2d55

sound/pci/hda/hda_codec.c

+16 −0
Original line number Diff line number Diff line
@@ -3504,6 +3504,22 @@ void snd_hda_codec_set_power_to_all(struct hda_codec *codec, hda_nid_t fg, 
}

EXPORT_SYMBOL_HDA(snd_hda_codec_set_power_to_all);



/*

 *  supported power states check

 */

static bool snd_hda_codec_get_supported_ps(struct hda_codec *codec, hda_nid_t fg,

				unsigned int power_state)

{

	int sup = snd_hda_param_read(codec, fg, AC_PAR_POWER_STATE);



	if (sup < 0)

		return false;

	if (sup & power_state)

		return true;

	else

		return false;

}



/*

 * set power state of the codec

 */